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CATEGORIES:Wednesday Seminars - Department of Computer Scienc
 e and Technology 
SUMMARY:One Bit is Not Enough: The Benefit of Reference An
 alysis in Virtual Memory Management - Frank Bellos
 a\, Karlsruhe Institute of Techology
DTSTART;TZID=Europe/London:20121128T141500
DTEND;TZID=Europe/London:20121128T151500
UID:TALK39272AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/39272
DESCRIPTION:For half a century operating systems used a single
  bit to make\nplacement and migration decisions fo
 r pages of memory.\nThe historic reference (“use”)
  bit in the page entry indicates\nif a memory page
  was used in the past. Heuristics (e.g.\, clock\na
 lgorithms) were built upon this single bit to extr
 act the reference\ncharacteristics supporting high
 er memory management strategies.\n\nWith the upcom
 ing of heterogeneous memory architectures with\nno
 n-uniform memory access\, the time has come to ret
 hink the\ninterface between the memory subsystem a
 nd the operating system\nto provide comprehensive 
 memory-reference information that\nguides memory m
 anagement decisions.\nThe talk demonstrates the de
 mand of operating systems for information\nabout a
 ccess frequency\, gap distribution\, and request o
 rigin to find\nthe best location and access policy
  for a memory region with respect\nto latency\, ba
 ndwidth\, and energy consumption.\n\n
LOCATION:Lecture Theatre 1\, Computer Laboratory
CONTACT:Stephen Clark
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